1. Jet Propulsion Laboratory/California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA.
2. Laboratory for Air and Space Physics (LASP), University of Colorado, Boulder, CO 80303, USA.
3. Space Environment Technologies, 320 North Halstead, Suite 170, Pasadena, CA 91107, USA.
4. Central Arizona College, Coolidge, AZ 85228, USA.